<!--SIF Implementation Specification 2.2-6 (March 17, 2008)-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" targetNamespace="http://www.sifinfo.org/infrastructure/2.x" xmlns:sif="http://www.sifinfo.org/infrastructure/2.x" elementFormDefault="qualified">
  <xs:import namespace="http://www.w3.org/XML/1998/namespace" schemaLocation="imports/xml/xml.xsd" />
  <xs:simpleType name="LearningStandardItemRelationshipTypesType">
    <xs:restriction base="xs:token">
      <xs:enumeration value="Content">
        <xs:annotation>
          <xs:documentation>A link to another state or school content standard</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="PD">
        <xs:annotation>
          <xs:documentation />
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="State">
        <xs:annotation>
          <xs:documentation>A link to a standard from another state.  The purpose of this is to express relationships between state standards.</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="Other">
        <xs:annotation>
          <xs:documentation>Any other type of relationship between the current standard and the target standard item.</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
</xs:schema>